this will sound crazy but I am an old man who has cured dogs the vet could not cure with " very used motor oil " new oil will not help or work at all.
very old burnt oil from a terrible running car has stuff in that old oil that will kill anything on a dog. I know it sounds crazy but it has always worked for me. good luck

Burnt motor oil is an old regimen........we would mix it with flowers of sulfur from the drug store. Yes, it helped. Of course they gave kids sulfur and cod liver oil to kill worms when my grandmother was little. Every spring. The dog we used it on ultimately developed skin cancer. I am a big fan of old time/natural methods but burnt motor oil is full of all kinds of cancer causing stuff. Not sure what she got into though.

When Grim got a staph infection on his paw the vet had us soak him twice a day in provodone-iodine in addition to the antibiotics.

You can put coconut oil on the rash. It is very soothing. Calendula cream would also be helpful.

I would keep him out of that water until the rash has healed. AFter that he should be thoroughly rinsed when he comes out.

Last summer Rafi got a horrible rash in his groin from something in the lake. It spread and spread. I tried everything but it wouldn't completely go away. The vet finally sold me Chlorhexidine pads and I treated him for two days and the rash was gone!

Could it be a hotspot? Moses had one a few years ago that went from the size of a dime to the entire side of his face over night. Do a search on here for Moses hotspot and you can see pics and treatment recommendations.

Vertericyn is handy to keep on hand.

Something else to consider:

Pythiosis of the skin (or cutaneous pythiosis) results in the development of swollen, non-healing wounds, and invasive masses of ulcerated pus-filled nodules and draining tracts. Tissue death (necrosis) follows, with the affected skin eventually turning black and wasting.

Causes

This infection is caused by direct contact with water that accommodates Pythium insidiosum, a water borne fungal parasite. It is usually swallowed or inhaled by the dog, and from there makes its way to the animal's intestinal tract.

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